硝酸铜化学活化制得的活性炭对CO2的吸附。,ACS Omega

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硝酸铜化学活化制得的活性炭对CO2的吸附。
ACS Omega ( IF 3.7 ) Pub Date : 2020-05-01 , DOI: 10.1021/acsomega.0c00342
Sergio Acevedo _{1,

2} , Liliana Giraldo _{1,

2} , Juan Carlos Moreno-Piraján ₃

Affiliation

活性炭是由木质纤维素材料，非洲棕榈壳（Elaeis guineensis）制备的，方法是用五种不同浓度的1-7％w / v Cu（NO3）2溶液化学浸渍前体。将它们在1073 K的二氧化碳气氛中碳化以获得不同的碳。通过氮气和二氧化碳的吸附等温线表征其结构特性，以评估孔径分布。确定了活性炭在苯，二氯甲烷和水中的浸入焓。还确定了材料在低压条件下在273 K下的CO2吸附容量。通过质谱，傅里叶变换红外光谱和程序升温还原进行化学表征。用上述浓度下的这种制备方法，获得了活化的微介孔碳，形成了高度介孔的固体，这有利于将CO2分子扩散到材料中。在这里，我们显示了获得的活性炭具有不同的纹理特征：表面布鲁瑙尔-埃米特-泰勒面积在473至1361 m2 g-1之间变化，微孔体积在0.18至0.51 cm3 g-1之间。具有最高结构参数值的活性炭为ACCu5-1073。用所使用的方法获得了微中孔固体。这很重要，因为它可能有助于CO2分子进入孔中。所制备材料中的CO2吸附值介于103至217 mg CO2 g-1之间；所获得的狭窄微孔的体积值在0.16至0之间。45立方厘米g-1。具有最大的CO2吸附能力和狭窄微孔体积的固体是ACCu3-1073。这些固体的使用对于将来的实际和工业应用是重要的。用铜的金属盐制备的活性炭中CO2的吸附动力学与颗粒内扩散模型非常吻合，对于该模型而言，扩散是限速步骤。从能量和动力学的观点来看，在制备的活性炭中CO 2的吸附是有利的，因为这些伴随着宽的介孔率的存在有利于CO 2进入微孔。用铜的金属盐制备的活性炭中CO2的吸附动力学与颗粒内扩散模型非常吻合，对于该模型而言，扩散是限速步骤。从能量和动力学的观点来看，在制备的活性炭中CO 2的吸附是有利的，因为这些伴随着宽的介孔率的存在有利于CO 2进入微孔。用铜的金属盐制备的活性炭中CO2的吸附动力学与颗粒内扩散模型非常吻合，对于该模型而言，扩散是限速步骤。从能量和动力学的观点来看，在制备的活性炭中CO 2的吸附是有利的，因为这些伴随着宽的介孔率的存在有利于CO 2进入微孔。

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Adsorption of CO2 on Activated Carbons Prepared by Chemical Activation with Cupric Nitrate.

Activated carbons were prepared from a lignocellulosic material, African palm shells (Elaeis guineensis), by chemical impregnation of the precursor with solutions of 1-7% w/v Cu(NO3)2 at five different concentrations. These were carbonized in a carbon dioxide atmosphere at 1073 K to obtain different carbons. Their textural properties were characterized by nitrogen and carbon dioxide adsorption isotherms in order to evaluate the pore-size distribution. The immersion enthalpies of the activated carbons in benzene, dichloromethane, and water were determined. The CO2 adsorption capacities of the materials at 273 K under low-pressure conditions were also determined. Chemical characterization was performed by mass spectrometry, Fourier transform infrared spectroscopy, and temperature-programmed reduction. With this method of preparation under the concentrations described, activated micro-mesoporous carbons were obtained, with the formation of highly mesoporous solids that favored the process of diffusion of molecules of CO2 into the material. Here, we show that activated carbons were obtained with different textural characteristics: surface Brunauer-Emmett-Teller areas varied between 473 and 1361 m2 g-1 and micropore volume between 0.18 and 0.51 cm3 g-1. The activated carbon with the highest values of textural parameters was ACCu5-1073. Micro-mesoporous solids were obtained with the methodology used. This is important as it may help the entry of CO2 molecules into the pores. The adsorption of CO2 in the materials prepared presented values between 103 and 217 mg CO2 g-1; the values of volume of narrow microporosity obtained were between 0.16 and 0.45 cm3 g-1. The solid with the greatest capacity for adsorption of CO2 and volume of narrow microporosity was ACCu3-1073. The use of these solids is of importance for future practical and industrial applications. The adsorption kinetic of CO2 in the activated carbons prepared with metallic salt of copper is in good accordance with the intraparticle diffusion model, for which diffusion is the rate-limiting step. The adsorption of CO2 in the prepared activated carbons is favorable from the energy and kinetic point of view, as these accompanied by the presence of wide micro-mesoporosity favor the entry of CO2 into the micropores.

更新日期：2020-05-01

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